Spark-arrester



B. C. HARDGROVE.

SPARK ARRESTER.

APPUCATION FILED AUGJ, 1919.

1,349, 151. Patented Aug. 10,1920.

2 SHEETS-SHEET1.

B. C. HARDGROVE.

SPARK ARRESTER.

APPLICATION FILED AUGJ, I9l9 1,349,151, rammemug. 1%,19241 2 SHEETS- SHEEI Z.

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UNITED STATES, PATENT OFFICE.

BURTON C. 'HARDGROVE, OF PORTLAND, OREGON, ASSIGNOR 0F ONE-HALF TO CLIFTON OSBORNE.

. v i Y SPARK-ARRESTER.

Specification of Letters Patent.

Application filed August 7, 1919. Serial No. 315,949.

' tains to make and use the same.

This invention relates to spark arresters. One object of this invention is togenerally improve upon devices of this character by providing an improved forami nated conical screen which is pivotally mounted within a chamber through which products of combustion pass, so that this screen may be swung from its normal position across the chamber to a lateral position within the chamber, thereby permitting the maximum draft while a fire is being kindled or developed within a furnaceor boiler in which the products of combustion are generated; the screen being in. its normal position during normal working operations.

A further object is to provide an improved supporting and limiting structure for the screen. 1

A further object is to provide a supplemental screen of finer mesh or with smaller foramina, this supplemental screen being disposed above the coarser screen so as to arrest sparks which are sufiiciently small to pass through the latter and cooperate therewith for holding these sparks or small cinders until they have become consumed by heat or pulverized and extinguished.

Another object is to provide an improved construction in .which a trough is formed below the screen and which cooperates with the screen for collecting. the cinders which have been arrested bythe latter.

Other objects and advantages may become apparent to persons who read the following details of description in connection with the accompanying drawings in which Figure l is a view partly in vertical sec tion and partly in elevation, the section being taken substantially along the line l-l of Fig. 3. i

Fig. 2 is a vertical sectional view, the section being taken substantially along the line 22 ofFig. 3. I

Fig. 3 is a horizontal sectional View, the

' section being taken of the trough substantially along the line 33 of F ig. l.

Fig. a is a detail viewof a combined hinge and bearing member element of the structure shown in Figs. 1 and 3.

Fig. 5 is a detail view illustrating an actuating device for rotating the screen-supporting shaft, the dotted lines illustrating the position of this actuating member when the screen is turned laterally.

'Fig. 6 is an enlarged sectional detail view, the section being taken along the line G(5 of Fig. 1.

Referring to these drawings in detail, in

which similar reference characters corre spend with similar parts throughout the several views, the invention comprises a chamber consisting of a cylindrical upper portion 1, a frusto-conical lower portion 2 and a cover or lid 3.

WVithin the lower end of the frusto-conical portion 2, is a cylindrical stack-attaching member i, the lower end of which is adapted to surround the upper end of a smoke-stack, and a ring 5 is secured to the inner surface of the member 4 to form a shoulder or seat which is adapted to rest on top of the stack. Apertured lugs or ears 6 may be secured on the lower end of the cylinder f, and bolts 7 may extend through the apertures of these lugs and cooperate therewithto bind the attaching member 4 on the stack. The upper end of the member 4L combines with the frust-o-conical element 2 to form a trough S, and an annular series of small perforations 9 is provided at the bottom of the trough 8 to permit perfect drainage of water from the trough into the cylinder 4. The element 2 is provided with one or more openings or outlets which extend approximately from the bottom to the top 8 and permits cinders and soot to pass from thetrough to the exterior of the chamber, and one or more spouts 10 communicate with the trough 8 through said opening or openings.

The cylinder 1 is provided, with bearings 11 at, diametrically opposite points approximately midway between the upper and lower ends of the cylinderl, these bearings being of the special construction shown in Fig. 4:. In this connection, it is to be understood that the cylinders l and 4: and the element 2 are Patented Aug. 10, 1920.

which constitutes an Therefore, the wall is thickened and rein f forced by the provision of vertical strips'or bars 13 and 14k of relatively heavy sheet metal which are riveted or otherwise appropriately secured to the cylinder 1 and ex-' tend from the bottom approximatelyto the top of the cylinder. The wall of the cylinder 1 is rendered still thicker by the-provision of the castings 15 which are riveted or otherwise secured to the bars 13 and 1 1. The upper end of the bar 13 forms a hinge element which combines-with a hinge ele-.'

ment 16 to form a hinge by means of which the lid or cover 3 is hinged to the, sparkarresting chamber. The upper end of the bar 1 1 may be provided with a staple 17 which coacts with a hasp 18 for securing the lid 3 in its closed position. The lid 3 is provided withan annular depending flange 19 which arrests small cinders and permits them to fall back into the chamber 1 where they may be'extinguished before passing out through the outlet opening in the ring 19.

Referring to Fig. 6, it will be seen that one side ofthe shaft 12 is flattened or slabbed and that an element 20 of a combined clamping and supporting device bears against the flattened side of the shaft; A clamping element 21 is secured to the clamping element 20 by means of bolts 22, and the elements 20, 21 =and 22 not only form aclamp which is rigidly united with the shaft 12, but a depending flange of the element 20 is formed with apertures through which bolts or rivets may extend for securing an annulus 23. to the shaft 12. Byreferring to Fig. 3 it will be seen that two of such devices (Fig. 6) are provided at diametrically opposed parts of the annulus 23.

In the middle portion of the shaft 12 provided'a clamping element 24 which coa'cts with. bolts 25 and a clamping element 26 of an. arm'27 to secure said arm in fixed relation to the shaft 12. This arm 27 extends radially from the shaft 12 and normally depends or extends downward, its lower end being screw-threaded and provided with clamping nuts which engage with the upper and. lower surfaces of a disk 28 having an upturned annular flange to which issecured.

; the lower end of a foraminated conical screen 29. This screen is preferably formed of relatively coarse woven wire, and its upper end or conic base is secured by any appropriate means to the annulus 23. A relatively finemeshed screen 30, preferably of woven wire, has is margin secured in any appropriate way to the screen 29 or to the annulus 23 where the screen 29 and annulus 23 unite. In other words, the screen 30 extends across the conic base of the; screen 29 and is fixed with relation thereto and to the annulus 23 and shaft 12. .Therefore, when the shaft 12 ,'is turned in its bearings,'the screens 29 and 30 are turned from the normal efiective position shown in Figs. 1 and 2 to the inefi'ective or out-of-the-way position shown in Fig.3. V V Inorder to limit the movement of the screens 29land 30 from the normal horizontal to thervertical or out-of-the-way position, an approximately"semi-circular flange 31 is secured tothe interior surface of the cylinder 1 and: normally extends under the annulus 23 and supportsthe latter in its horizontal position, but when the annulus 23 stands in'the vertical positlon, its outwardly extending flange bears against theends of the flange 31, as indicated at 31. In order to resist the impact of exhaust steam which may pass Wltll the smoke and cinders into contact with the screens, an approximately semi-circular. flange 32 is secured to and extends inward from the vertical wall of the cylinder 1, and the annulus 23 normally bears upward against this flange 32.

In practice, the screen 29 may be selected with openings or foramina of greater or less v size, according to the kind orquality of coal or other fuel being used in producing the products of'combustion which pass through this screen, and the screen 30 is similarly selected, 'butin every instance, the screen 30 is of'a much finer mesh than the screen. 29,

so that the relatively coarse and strong.

screen 29 arrests the relatively large cinders which would detrimentally affect the finer screen 30; but this finer screen arrests smaller cinders or sparks which pass through the coarser screen, and these finer cinders are'consumed or pulverized between the screens 29 and 30, it being understood that when such finer cinders fall back from the screen 30, they either pass through the screen 29 or are deflected thereby onto the disk 28 where they remain until they are consumed or dumped from the plate 28 whentheparts are turned'into the position shown in Fig. 3. Because of the. conical shape of the screen 29 and the spreading effect thereof and of the disk 28, mostof the finer cinders and sparks which pass through the screens 29 and 30 strike against the lid or cover 3 and are arrested by the depending flange 19 where they areconsumed or pulverized.

An -S-shaped lever 33' is non-rotatably fitted on the shaft 12, and chains 3 1 maybe connected to this leverand extendedto any suitable operatin station where suitable 'anchoring means (not shown) may be employed to hold the chains and thereby hold the screens in the diflerentadjustments.

Although I have described this embodiment of my invention very specifically, it is not intended to limit this invention to these exact details of construction, but changes may be made within the scope of the inventive ideas as implied and claimed.

What I claim as my invention is 1. In a spark arrester, a chamber through which products of combustion can pass, a foraminous screen substantially in the shape of an inverted cone, a rotary shaft extending across the interior of said chamber, an arm on and extending radially from said shaft, and a disk having its central part secured to said arm and its peripheral part secured to the apex-end of said screen.

2. In a spark arrester, a chamber through which products'of combustion can pass, a rotary shaft extending radially across said chamber, a depressed foraminous screen, a radially flanged annulus united with the margin of said screen, means rigidly securing said annulus to said shaft, an arcuate inwardly projecting flange extending horizontally across the inner surface of said chamber normally over and .against the flange of said annulus, and an arcuate inwardiy projecting flange extending horizontally across the opposite side of said inner su face and being normally under and inst the flange of said annulus.

3. In a spark arrester, a chamber through which products of combustion can pass, a

rotary shaft extending radially across said chamber, a depressed foraminous screen, a radially flanged annulus united with the margin of said screen, means rigidly securing said annulus to said shaft, an arcuate inwardly projecting flange extending horizontally across the inner surface of said chamber normally over and against the flange of said annulus, an arcuate inwardly projecting flange extending horizontally across the opposite side of said inner surface and being normally under and against the flange of said annulus, and an arm connecting the middle portion of said depressed screen with said rotary shaft.

4. In a spark arr-ester, a chamber having inlet and outlet openings, a stack-attaching collar extending up into said inlet and having its upper end spaced from the surrounding chamber to form a trough, the inner side of said trough being formed with small perforations at its bottom to permit water to drain therefrom into the interior of the stack, and a spout communicating with the outer side of said trough to provide an outlet for solid matter.

In testimony whereof I have hereunto set my hand.

BURTON C. HARDGROVE. 

